Replace string with regular expression

    
// --------------------------------------------------------------------------------------------------------------------
// <copyright file="Utils.cs" company="Collaboris Ltd.">
//   Copyright (c) Collaboris Ltd. All rights Reserved.
// </copyright>
// <summary>
//   The utils.
// </summary>
// --------------------------------------------------------------------------------------------------------------------

namespace Collaboris.DataAccess
{
    #region Imports

    using System;
    using System.Web;

    #endregion

    /// <summary>
    /// The utils.
    /// </summary>
    public class Utils
    {
        #region [rgn] Methods (2)

        /// <summary>
        /// The replace ex.
        /// </summary>
        /// <param name="original">
        /// The original.
        /// </param>
        /// <param name="pattern">
        /// The pattern.
        /// </param>
        /// <param name="replacement">
        /// The replacement.
        /// </param>
        /// <returns>
        /// The replace ex.
        /// </returns>
        public static string ReplaceEx(string original, string pattern, string replacement)
        {
            int count, position0, position1;
            count = position0 = position1 = 0;
            string upperString = original.ToUpper();
            string upperPattern = pattern.ToUpper();
            int inc = (original.Length / pattern.Length) * (replacement.Length - pattern.Length);
            var chars = new char[original.Length + Math.Max(0, inc)];
            while ((position1 = upperString.IndexOf(upperPattern, position0)) != -1)
            {
                for (int i = position0; i < position1; ++i)
                {
                    chars[count++] = original[i];
                }

                for (int i = 0; i < replacement.Length; ++i)
                {
                    chars[count++] = replacement[i];
                }

                position0 = position1 + pattern.Length;
            }

            if (position0 == 0)
            {
                return original;
            }

            for (int i = position0; i < original.Length; ++i)
            {
                chars[count++] = original[i];
            }

            return new string(chars, 0, count);
        }

       
        #endregion [rgn]
    }
}

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Replace string with regular expression : Match « Regular Expressions « C# / C Sharp

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